/* Copyright (c) 1998 John E. Davis (davis@space.mit.edu)
 *
 * This file is part of slrn.
 *
 * Slrn is free software; you can redistribute it and/or modify it
 * under the terms of the GNU General Public License as published by the
 * Free Software Foundation; either version 2, or (at your option) any
 * later version.
 * 
 * Slrn is distributed in the hope that it will be useful, but WITHOUT
 * ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or
 * FITNESS FOR A PARTICULAR PURPOSE.  See the GNU General Public License
 * for more details.
 * 
 * You should have received a copy of the GNU General Public License
 * along with Slrn; see the file COPYING.  If not, write to the Free
 * Software Foundation, 59 Temple Place - Suite 330, 
 * Boston, MA  02111-1307, USA.
 */

/* It is too bad that this cannot be done at the preprocessor level.
 * Unfortunately, C is not completely portable yet.  Basically the #error
 * directive is the problem.
 */
#include "config.h"

#include <stdio.h>
#ifdef VMS
# include <ssdef.h>
#endif

#ifdef HAVE_STDLIB_H
# include <stdlib.h>
#endif

#include <slang.h>
#include "jdmacros.h"

#ifdef VMS
# define SUCCESS	1
# define FAILURE	2
#else
# define SUCCESS	0
# define FAILURE	1
#endif

static char *make_version (unsigned int v)
{
   static char v_string[16];
   unsigned int a, b, c;
   
   a = v/10000;
   b = (v - a * 10000) / 100;
   c = v - (a * 10000) - (b * 100);
   sprintf (v_string, "%u.%u.%u", a, b, c);
   return v_string;
}



int main (int argc, char **argv)
{
   unsigned int min_version, sl_version;
   unsigned int sug_version;
   int ret;
   
   if ((argc < 3) || (argc > 4))
     {
	fprintf (stderr, "Usage: %s <PGM> <SLANG-VERSION> <SUGG VERSION>\n", argv[0]);
	return FAILURE;
     }
#ifndef SLANG_VERSION
   sl_version = 0;
#else
   sl_version = SLANG_VERSION;
#endif
   
   sscanf (argv[2], "%u", &min_version);
   if (argc == 4) sscanf (argv[3], "%u", &sug_version);
   else sug_version = sl_version;
   
   
   ret = SUCCESS;
   if (sl_version < min_version)
     {
	fprintf (stderr, "This version of %s requires slang version %s.\n",
		 argv[1], make_version(min_version));
	ret = FAILURE;
     }
   
   if (sl_version < sug_version)
     {
	fprintf (stderr, "Your slang version is %s.\n", make_version(sl_version));
	fprintf (stderr, "To fully utilize this program, you should upgrade the slang library to\n");
	fprintf (stderr, "  version %s\n", make_version(sug_version));
	fprintf (stderr, "This library is available via anonymous ftp from\n\
space.mit.edu in pub/davis/slang.\n");
     }
   
   return ret;
}